Hi Michael, thank you for your suggestion. I would call it a bug. pos should always be equal to poscorr. This is implemented in changeset 3079.
Best, André Am 14.05.2011 um 13:58 schrieb Michael J Gruber: > Currently, the pos parameter gives the position of the head of tip of > the arrow. This is problematic when one wants to position the arrow in > the middle of a line or arc: pos=0.5 gives an arrow which is visually > off the middle (it is visually to the left of it). > > Introduce a parameter poscorr which shifts the arrow by an amount which > is relative to the size of the arrowhead (and the constriction). > > poscorr=0 is the default (tip at pos) > poscorr=1 puts the constriction center at pos > --- > pyx/deco.py | 21 +++++++++++++++------ > 1 files changed, 15 insertions(+), 6 deletions(-) > > diff --git a/pyx/deco.py b/pyx/deco.py > index 3206627..41848db 100644 > --- a/pyx/deco.py > +++ b/pyx/deco.py > @@ -431,20 +431,23 @@ class arrow(deco, attr.attr): > > """arrow is a decorator which adds an arrow to either side of the path""" > > - def __init__(self, attrs=[], pos=1, reversed=0, size=_base, angle=45, > constriction=0.8): > + def __init__(self, attrs=[], pos=1, poscorr=0, reversed=0, size=_base, > angle=45, constriction=0.8): > self.attrs = attr.mergeattrs([style.linestyle.solid, filled] + attrs) > attr.checkattrs(self.attrs, [deco, style.fillstyle, > style.strokestyle]) > self.pos = pos > + self.poscorr = poscorr > self.reversed = reversed > self.size = size > self.angle = angle > self.constriction = constriction > > - def __call__(self, attrs=None, pos=None, reversed=None, size=None, > angle=None, constriction=_marker): > + def __call__(self, attrs=None, pos=None, poscorr=None, reversed=None, > size=None, angle=None, constriction=_marker): > if attrs is None: > attrs = self.attrs > if pos is None: > pos = self.pos > + if poscorr is None: > + poscorr = self.poscorr > if reversed is None: > reversed = self.reversed > if size is None: > @@ -453,11 +456,12 @@ class arrow(deco, attr.attr): > angle = self.angle > if constriction is _marker: > constriction = self.constriction > - return arrow(attrs=attrs, pos=pos, reversed=reversed, size=size, > angle=angle, constriction=constriction) > + return arrow(attrs=attrs, pos=pos, poscorr=poscorr, > reversed=reversed, size=size, angle=angle, constriction=constriction) > > def decorate(self, dp, texrunner): > dp.ensurenormpath() > anormpath = dp.path > + arclen = anormpath.arclen() > > # calculate absolute arc length of constricition > # Note that we have to correct this length because the arrowtemplates > are rotated > @@ -472,17 +476,22 @@ class arrow(deco, attr.attr): > constrictionlen = self.size * 1 * > math.cos(math.radians(self.angle/2.0)) > arrowheadconstrictionlen = None > > - arclenfrombegin = self.pos * anormpath.arclen() > direction = self.reversed and -1 or 1 > + selfpos = self.pos > + if self.poscorr: > + selfpos += direction * self.poscorr * constrictionlen / arclen > + selfpos = max(0, min(1, selfpos)) > + > + arclenfrombegin = selfpos * arclen > arrowhead = _arrowhead(anormpath, arclenfrombegin, direction, > self.size, self.angle, arrowheadconstrictionlen) > > # add arrowhead to decoratedpath > dp.ornaments.draw(arrowhead, self.attrs) > > # exlude part of the path from stroking when the arrow is strictly at > the begin or the end > - if self.pos == 0 and self.reversed: > + if selfpos == 0 and self.reversed: > dp.excluderange(0, min(self.size, constrictionlen)) > - elif self.pos == 1 and not self.reversed: > + elif selfpos == 1 and not self.reversed: > dp.excluderange(anormpath.end() - min(self.size, > constrictionlen), anormpath.end()) > > arrow.clear = attr.clearclass(arrow) > -- > 1.7.5.1.445.gf3e03 > > > ------------------------------------------------------------------------------ > Achieve unprecedented app performance and reliability > What every C/C++ and Fortran developer should know. > Learn how Intel has extended the reach of its next-generation tools > to help boost performance applications - inlcuding clusters. > http://p.sf.net/sfu/intel-dev2devmay > _______________________________________________ > PyX-devel mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/pyx-devel -- by _ _ _ Dr. André Wobst, Amselweg 22, 85716 Unterschleißheim / \ \ / ) [email protected], http://www.wobsta.de/ / _ \ \/\/ / PyX - High quality PostScript and PDF figures (_/ \_)_/\_/ with Python & TeX: visit http://pyx.sourceforge.net/
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